The potentially neglected culprit of DC surface flashover: electron migration under temperature gradients

Abstract This report intends to reveal the role of electron migration and its effects in triggering direct current (DC) surface flashover under temperature gradient conditions when using epoxy-based insulating composites. The surface potential and the surface flashover voltage are both measured usin...

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Autores principales:	Chuanyang Li, Jun Hu, Chuanjie Lin, Jinliang He
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b7ae7ea2d19745019bc911f170659192
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spelling	oai:doaj.org-article:b7ae7ea2d19745019bc911f1706591922021-12-02T16:06:33ZThe potentially neglected culprit of DC surface flashover: electron migration under temperature gradients10.1038/s41598-017-03657-12045-2322https://doaj.org/article/b7ae7ea2d19745019bc911f1706591922017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03657-1https://doaj.org/toc/2045-2322Abstract This report intends to reveal the role of electron migration and its effects in triggering direct current (DC) surface flashover under temperature gradient conditions when using epoxy-based insulating composites. The surface potential and the surface flashover voltage are both measured using insulators that are bridged between two thermo-regulated electrodes. The space charge injection and migration properties under different temperature are detected. The results show that the surface potential rises significantly because of electron migration near the high voltage (HV) electrode under high temperature conditions, thus creating an “analogous ineffective region”. The expansion of this “analogous ineffective region” results in most of the voltage drop occurring near the ground electrode, which serves as an important factor triggering positive streamers across the insulation surface. This work is helpful in understanding of DC surface flashover mechanism from a new perspective and also has important significance in design of a suitable DC insulator to avoid surface flashover problem.Chuanyang LiJun HuChuanjie LinJinliang HeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chuanyang Li Jun Hu Chuanjie Lin Jinliang He The potentially neglected culprit of DC surface flashover: electron migration under temperature gradients
description	Abstract This report intends to reveal the role of electron migration and its effects in triggering direct current (DC) surface flashover under temperature gradient conditions when using epoxy-based insulating composites. The surface potential and the surface flashover voltage are both measured using insulators that are bridged between two thermo-regulated electrodes. The space charge injection and migration properties under different temperature are detected. The results show that the surface potential rises significantly because of electron migration near the high voltage (HV) electrode under high temperature conditions, thus creating an “analogous ineffective region”. The expansion of this “analogous ineffective region” results in most of the voltage drop occurring near the ground electrode, which serves as an important factor triggering positive streamers across the insulation surface. This work is helpful in understanding of DC surface flashover mechanism from a new perspective and also has important significance in design of a suitable DC insulator to avoid surface flashover problem.
format	article
author	Chuanyang Li Jun Hu Chuanjie Lin Jinliang He
author_facet	Chuanyang Li Jun Hu Chuanjie Lin Jinliang He
author_sort	Chuanyang Li
title	The potentially neglected culprit of DC surface flashover: electron migration under temperature gradients
title_short	The potentially neglected culprit of DC surface flashover: electron migration under temperature gradients
title_full	The potentially neglected culprit of DC surface flashover: electron migration under temperature gradients
title_fullStr	The potentially neglected culprit of DC surface flashover: electron migration under temperature gradients
title_full_unstemmed	The potentially neglected culprit of DC surface flashover: electron migration under temperature gradients
title_sort	potentially neglected culprit of dc surface flashover: electron migration under temperature gradients
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/b7ae7ea2d19745019bc911f170659192
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The potentially neglected culprit of DC surface flashover: electron migration under temperature gradients

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